Lot Essay
This unusual rule is for fixing around the edge of a plane table. An example is illustrated by Turner.
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Details
An unusual 18th-Century boxwood plane table rule and square protractor,
unsigned, forming a rectangle hinged at the corners and in the centre of two opposite sides to fold flat, one face with a degree scale 0-180°, the other 1-360°, all sides with graduations in inches either 10-0-10 or 8-0-8 -- 50.8 x 40.6cm. (20 x 16in.) (open)
unsigned, forming a rectangle hinged at the corners and in the centre of two opposite sides to fold flat, one face with a degree scale 0-180°, the other 1-360°, all sides with graduations in inches either 10-0-10 or 8-0-8 -- 50.8 x 40.6cm. (20 x 16in.) (open)
Literature
TURNER, A., Early Scientific Instruments: Europe 1400-1800 (London, 1987) p.242
Special notice
No VAT will be charged on the hammer price, but VAT at 17.5% will be added to the buyer's premium, which is invoiced on a VAT inclusive basis.